Preparation method of thermal barrier coating containing bilayer structure of bonding layers

A technology of thermal barrier coating and double-layer structure, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve the problems of reduced thermal conductivity and low porosity of coatings, and prevent diffusion , high temperature and controllable thickness

Inactive Publication Date: 2015-06-03
HENAN PULAIMU COATING TECH +1
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Problems solved by technology

This patent application is aimed at the preparation of functionally graded thermal barrier coatings, the coatings prepared by this method will inevitably reduce the thermal conductivity of the coating due to the low porosity and the simultaneous mixing of metal particles with high thermal conductivity
And double-layer or multi-layer structure bonding layer is then not seen in the report

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  • Preparation method of thermal barrier coating containing bilayer structure of bonding layers
  • Preparation method of thermal barrier coating containing bilayer structure of bonding layers
  • Preparation method of thermal barrier coating containing bilayer structure of bonding layers

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preparation example Construction

[0032] A method for preparing a thermal barrier coating containing a double-layer structural bonding layer, using the following steps:

[0033] (1) The metal substrate is degreased and sandblasted sequentially;

[0034] (2) preparing the first bonding layer consisting of NiCoCrAlY on the metal substrate by low-pressure plasma spraying, high-velocity oxygen flame spraying or high-speed compressed air flame spraying;

[0035] (3) preparing a second bonding layer composed of FeCrAlY on the first bonding layer by atmospheric plasma spraying, high-velocity oxygen flame spraying or high-speed compressed air flame spraying;

[0036] (4) Deposit a ceramic layer on the double-layer bonding layer by atmospheric plasma spraying, high-velocity oxygen flame spraying, solution plasma spraying or electron beam physical vapor deposition technology, and the composition of the ceramic layer is 6~8wt% Y 2 o 3 Stable ZrO 2 or RE 2 Zr 2 o 7 , where RE is a rare earth element.

[0037]The bl...

Embodiment 1

[0045] A method for preparing a thermal barrier coating containing a double-layer structural bonding layer, using the following steps:

[0046] (1) First, use Al with a particle size of 16 to 120 mesh for the metal substrate 1 2 o 3 , sandblasting the substrate to obtain a uniform surface roughness;

[0047] (2) When low-pressure plasma spraying is used in step (2), the distance between the spray gun and the metal substrate is 100-250mm, the moving speed of the spray gun is 300-1000mm / s, the powder feeding rate is 10-70g / min, and the powder feeding airflow is 0.5~1.2L / min, voltage range is 100~180V, spraying current range is 200~250A, vacuum degree is less than 20KPa. The first bonding layer 2 is introduced on the metal substrate 1. The composition of the bonding layer is NiCoCrAlY. In this method, the ceramic particles are heated and melted or semi-melted by a high-temperature plasma beam, and then quickly sprayed on the surface of the substrate to form a layer with struct...

Embodiment 2

[0052] A method for preparing a thermal barrier coating containing a double-layer structural bonding layer, using the following steps:

[0053] (1) The metal substrate is degreased and sandblasted sequentially. The sandblasting pressure used in the sandblasting treatment is 0.1MPa, and the main component of the sandblasting particles is Al 2 o 3 , the particle size is 16 mesh;

[0054] (2) Prepare the composition and be the first adhesive layer of NiCoCrAlY on the metal substrate by low-pressure plasma spraying, during low-pressure plasma spraying, the distance between the spray gun and the metal substrate is 100mm, the moving speed of the spray gun is 300mm / s, and the powder feeding rate is 10g / s min, the powder feeding airflow is 0.5L / min, the voltage range is 100V, the spraying current range is 200A, and the vacuum degree is less than 20KPa;

[0055] (3) Depositing a second bonding layer on the first bonding layer by atmospheric plasma spraying, the composition of the bon...

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Abstract

The invention relates to a preparation method of a thermal barrier coating containing a bilayer structure of bonding layers. A metal substrate is subjected to deoiling and sand blasting treatment; a first bonding layer is deposited on the metal substrate through low-pressure plasma spraying, high-velocity oxygen flame spraying or high-velocity compressed air flame spraying; a second bonding layer is deposited through atmosphere plasma spraying, high-velocity oxygen flame spraying or high-velocity compressed air flame spraying; a ceramic thermal insulating layer is deposited on the second bonding layer through atmosphere plasma spraying, high-velocity oxygen flame spraying, solution plasma spraying or an electron beam physical vapor deposition technology. Compared with conventional MCrAlY thermal barrier coating adopting a single bonding layer, M is Ni, Cr and the like, the prepared thermal barrier coating adopting the double bonding layers has higher use temperature, Ni2Al2O4 fragility phase is avoided for the interfacial properties of the bonding layers and the ceramic layer, sufficient Al is supplied, roughness of an interface is kept, the coating has more excellent oxidation resistance and organization structure stability, and the service life of the coating is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of thermal barrier coatings, in particular to a preparation method of a thermal barrier coating containing a double-layer structural bonding layer. Background technique [0002] Thermal barrier coating usually refers to a ceramic coating deposited on a metal surface with good heat insulation effect. It is a coating system composed of a bonding layer with high temperature oxidation resistance and a ceramic layer with heat insulation effect. It is of great significance to ensure the long-term service of hot-end components such as gas turbines and engines, and the bonding layer is an important part of the thermal barrier coating, and its performance directly affects the life of the thermal barrier coating system. [0003] At present, the composition of the bonding layer is mainly MCrAlY (M is Ni, Co or Ni+Co) and (Ni, Pt) Al. In ground gas turbines, MCrAlY (M=Ni, Co) is the most commonly used, and its operating temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/08C23C4/10C23C14/06C23C4/073C23C4/11C23C4/129C23C4/134
CPCC23C4/10C23C28/3215
Inventor 陈文夫周新义郭芳威赵晓峰肖平
Owner HENAN PULAIMU COATING TECH
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